Downloading apps to your cell phone. Refer to the survey of cell phone owners, Exercise 4.27 (p.
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Downloading apps to your cell phone. Refer to the survey of cell phone owners, Exercise 4.27 (p. 221). There you were given the probability distribution for x, the number of apps used at least once a week by cell phone owners who have downloaded an app to their phone. LO9
a. Find the mean and variance of x.
b. Give an interval that will contain the value of x with a probability of at least .75.
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